HIFROM GX25 Engine HHB25 ULT425 Replace Carburetor for Honda UMS425 UMK425 Trimmer Carb This carburetor is specifically made for Honda GX25 engines, fits GX25 engine/motors, lawn mower, generator, water pumps, scooters & more Carburetor for Honda GX25 engines HHB25 ULT425 UMS425 UMK 425, these engines are used on various machines Please be aware some sellers claim the GX25 and GX35 carburetors are interchangeable - this isn't the case Please check the pictures and size carefully before you buy it HIFORM focus on provide high quality carburetor at fair price, professional technical support